Provenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry

Gregory Amoke 9 PAGES (4302 WORDS) Article
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bstract
-
The p
et
rographic and geochemical study of sandstones of Eze
-
Aku Formation (Turonian)
outcropping in Ugep area souther
n Benue Trough Nigeria was carried out to ascertain the sandstone
provenance and tectonic setting. Field studies show that the sandones occur in linear, parallel northeast
-
southwest trending ridges alternating with shale sequence. The sandstone facies show
coarsening
upward sequence, slightly bioturbated, cross
-
stratified, rippled bedded which infer foreshore to shallow
marine below wave base. Petrographic studies show the occurrence of quartz, feldspar, rock fragments
and muscovite. The calculated framework grains suggest feldsparthic (subarkosic) sandstone. The
geochemical analysis of the major elements of the sandstones show that they are enriched in SiO
2
, TiO
2
,
Al
2O
3
and Fe
2O
3
and depleted in K
2
O, Na
2
O, MgO and CaO. Tectonic setting discrimination plot
d
iagrams based on major elements suggest the provenance for the sandstones to be of metamorphic
and igneous rocks of Passive Continental Margin Basin. The results of petrographic and geochemical
study suggest Oban Massif and Cameroon Basement as the source regions for the sandstone which are
characterized by humid climate and low
-
relief during the Turonian.
Keyw
ords :
eze-
aku fo
rmation, petrography, geoche
-
mistry, sandst
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APA

Gregory, A (2019). Provenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry. Afribary.com: Retrieved September 18, 2019, from https://afribary.com/works/provenance-and-tectonic-setting-of-amasiri-sandstone-turonian-in-ugep-area-southern-benue-trough-nigeria-evidences-from-petrography-and-geochemistry

MLA 8th

Amoke, Gregory. "Provenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry" Afribary.com. Afribary.com, 09 Sep. 2019, https://afribary.com/works/provenance-and-tectonic-setting-of-amasiri-sandstone-turonian-in-ugep-area-southern-benue-trough-nigeria-evidences-from-petrography-and-geochemistry . Accessed 18 Sep. 2019.

MLA7

Amoke, Gregory. "Provenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry". Afribary.com, Afribary.com, 09 Sep. 2019. Web. 18 Sep. 2019. < https://afribary.com/works/provenance-and-tectonic-setting-of-amasiri-sandstone-turonian-in-ugep-area-southern-benue-trough-nigeria-evidences-from-petrography-and-geochemistry >.

Chicago

Amoke, Gregory. "Provenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry" Afribary.com (2019). Accessed September 18, 2019. https://afribary.com/works/provenance-and-tectonic-setting-of-amasiri-sandstone-turonian-in-ugep-area-southern-benue-trough-nigeria-evidences-from-petrography-and-geochemistry